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The check valve in the oil filter should keep it mostly full of oil. quality oil filters tend to do a better job of this. (OEM Toyota) I have replaced oil filters that felt really heavy due to incorrect change interval. The filter will start to bypass (no longer filter the oil) once it becomes plugged/ restricted.
When you see the cheap "paper" media Fram uses verses the Napa or the Wix you'll understand. The latter two won't collapse and block and by-pass your filter. You don't even know this is happening. so you are just blindly happy with a lower grade product. Just sayin' from years of mechanic experience and viewing engine failures.
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